ad549sh-883b Analog Devices, Inc., ad549sh-883b Datasheet

ad549sh-883b

Manufacturer Part Number

ad549sh-883b

Description

Ultralow Input Bias Current Operational Amplifier

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD549SH-883B.pdf (20 pages)

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FEATURES

Ultralow input-bias current

Input-bias current guaranteed over common-mode

Low offset voltage

Low offset drift

Low power

4 μV p-p 0.1 Hz to 10 Hz

MIL-STD-883B parts available

GENERAL DESCRIPTION

The AD549

with very low input bias current. Input offset voltage and input

offset voltage drift are laser trimmed for precision performance.

The part’s ultralow input current is achieved with “Topgate” JFET

technology, a process development exclusive to Analog Devices,

Inc. This technology allows fabrication of extremely low input

current JFETs compatible with a standard junction isolated

bipolar process. The 10

results from the bootstrapped input stage, ensures that the input

current is essentially independent of common-mode voltage.

The AD549 is suited for applications that require very low input

current and low input offset voltage. It excels as a preamp for a

wide variety of current output transducers, such as photo-

diodes, photomultiplier tubes, or oxygen sensors. The AD549

can also be used as a precision integrator or low droop sample

and hold. The AD549 is pin compatible with standard FET and

electrometer op amps, allowing designers to upgrade the

performance of present systems at little additional cost.

The AD549 is available in a TO-99 hermetic package. The case

is connected to Pin 8 so that the metal case can be independ-

ently connected to a point at the same potential as the input

terminals, minimizing stray leakage to the case.

Rev. G

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Protected by U.S. Patent No. 4,639,683.

60 fA maximum (AD549L)

250 fA maximum (AD549J)

voltage range

0.25 mV maximum (AD549K)

1.00 mV maximum (AD549J)

5 μV/°C maximum (AD549K)

20 μV/°C maximum (AD549J)

700 μA maximum supply current

Low input voltage noise

is a monolithic electrometer operational amplifier

Ω common-mode impedance, which

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

APPLICATIONS

Electrometer amplifier

Photodiode preamp

pH electrode buffer

Vacuum ion gauge measurement

The AD549 is available in four performance grades. The J, K,

and L versions are rated over the commercial temperature range

of 0°C to +70°C. The S grade is specified over the military

temperature range of −55°C to +125°C and is available

processed to MIL-STD-883B, Rev. C. Extended reliability plus

screening is also available. Plus screening includes 168 hour

burn-in, as well as other environmental and physical tests

derived from MIL-STD-883B, Rev. C.

PRODUCT HIGHLIGHTS

Ultralow Input-Bias Current

The AD549 input currents are specified, 100% tested, and

guaranteed after the device is warmed up. They are guaran-

teed over the entire common-mode input voltage range.

The AD549 input offset voltage and drift are laser trim-

med to 0.25 mV and 5 μV/°C (AD549K), and to 1 mV and

20 μV/°C (AD549J).

A maximum quiescent supply current of 700 μA minimizes

heating effects on input current and offset voltage.

AC specifications include 1 MHz unity gain bandwidth

and 3 V/μs slew rate. Settling time for a 10 V input step is

5 μs to 0.01%.

NONINVERTING

INVERTING

OFFSET NULL

CONNECTION DIAGRAM

NC = NO CONNECTION

Operational Amplifier

INPUT

GUARD PIN, CONNECTED TO CASE

INPUT

Figure 1.

AD549

10kΩ

V–

TRIM

V+

OFFSET

NULL

–15V

OUTPUT

www.analog.com

AD549

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